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近几年来,列不等式(组)解决实际问题,已成为中考命题的新的热点;不等式与有关知识相结合,编拟出具有特色、有新意的试题.下面选解此类问题,以开拓同学们的视野. 例1 某工厂现有甲种原料360千克,乙种原料290千克,计划利用这两种原料生产A、B两种产品共50件,已知生产一件A种产品,需用甲种原料9千克,乙种原料3千克,可获利润700元;已知生产一件B种产品,需用甲种原料4千克,乙种原料10千克,可获利润1200元.按要求安排A、B两种产品的生产件数,有哪几种方案?请你给设计出来. 解:设安排生产A种产品x件,则生产B种产品为(50-x)件.
In recent years, listed inequalities (groups) to solve practical problems have become a new hot spot in the propositions of informatics; inequalities and related knowledge have been combined to prepare test questions with distinctive features and new ideas. The following solutions are selected to develop students. Our vision. Example 1 A plant currently has 360kg of raw materials and 290kg of B materials. It plans to use these two materials to produce 50 products of A and B. It is known to produce one A product. A kind of raw materials 9 kg, 3 kinds of raw materials, 3 kg, can be a profit of 700 yuan; known to produce a B kind of products, need to use a 4 kg of raw materials, 10 kinds of raw materials, 10 kg, profit can be 1200. Arranged according to requirements A, B, the number of production of the two products, there are several kinds of programs? Please give your design. Solution: set the production of A product x, then the production of B products (50-x) pieces.